In business, we often hear the importance of having an elevator pitch. If you're not sure what this is, here's an article that does a good job of explaining how to craft one. Obviously, an elevator pitch only gets better with time. Not only will you tweak and modify it over time, but you will begin to own it. It will become a succinct proclamation of what you are about.
As you work on yours, remember to keep it short, personal, focused and engaging... much like this well known pitch.